Check the wires that come through the tailgate, constant flexing may cause a brakw in one of the wires also with all these stopping at the same time they probably share the same ground. If you apply a ground wire to the circuit and it works you must find where it is broken and repair it.

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What you will need to do is to remove the small plastic cap on the wiper arm by prying it off with a screw driver. Then remove the nut that holds the arm onto the shaft. Then get yourself a battery cable puller (from auto parts store) and pull the arm off of the shaft..

Can you hear the washer pump running when you operate the washer switch? The washer pump is in the bottom (side) of the washer fluid reservoir. You should hear it running. If not, you can disconnect the wire connector at the pump and use a test light to check to see if there is power and ground at the connector when you operate the switch. If there is power and ground, replace the washer pump motor. If there is no power or ground, you most likely have a bad washer control switch. (You have to replace the entire Multifunction Switch)

If you can hear the pump running, check for washer fluid pouring on the ground. If this is the case, you have a broken hose between the washer pump and the jets that spray on your windshield.

Also note that there is no way possible that your problem could be CAUSED by a fuse!
For more information on this subject, please review this article: Where's The Fuse?

i may be mistaken on if this applies to your model year but if the rear wiper does not work then check the fuse for rear wiper and replace if blown. make sure rear wiper switch is off and wiper is parked.if air bag light goes out after a few seconds then the rear wiper motor is bad causing fuse to blow. air bag module gets power for its fuse through wiper fuse.if wiper is not parked then fuse may blow when you turn yhe key on.you have two choices. replace wiper motor or remove tailgate door panel and unplug the motor

Unscrew inside panel on tailgate (3 screws-1 each side, 1 in the
middle), unclip and remove by pulling up and out towards the rear.
Unscrew all screws holding steel plate down, unclip plastic clips that
hold the rod running behind the plate and unhook rod at top of that
opens the window.
Unclip wiring harnesses, remove wiper from the outside (1 nut holding
it down)and unbolt the motor. It is pretty self explanatory once you
have the steel plate removed, just remove and install the screws and
clips in the same order and try it out before you put all your screws
back into the steel plate since there are so many. Back window must be
closed for wiper motor to work. To save yourself from replacing the
motor with a new one, 9 out of 10 times it is simply the locking washer
has come off of the gear inside the motor, if you pop off the plastic
motor cover you will see the washer is off the gears are out of place.
I realigned the gear and replaced the washer with a "C" clip and it has
been working great for over a year!

Check to be sure there is not a seperate fuse for the wiper. Check power and ground at the motor. if you have power and ground replace the motor. if you don't, check for a break in the wires where the harness bends at the tailgate. take the interior door trim apart to unlock and open then inspect the inside of the door and all components. i can't really help with seeing it. the econolines have issues with the lock cylinders.

Check in your user's manual for your fuse location on the rear windshield wiper. These grand cherokee's have electronic actuators in every door. Inside these actuators they have very little motors and move everything via plastic. Very bad design flaw, as most of these actuators are 300-400 dollars to replace. You can find ones in salvage yards for 50 though. On your rear hatch, the door and the window are run by this actuator.